Hi noneedlessnoise,
Again … I would follow the steps in post #1 here which will give you all the information, steps and guidelines you need to make good choices. I would certainly start locally to test some latex mattresses so you have a sense of the type of mattress that fits your needs and preferences based on your own experiences if possible. The same post also links to a list of some of the manufacturing members here who make some of the best quality and value mattresses in the country (including Brooklyn Bedding which makes the Dreamfoam mattresses on amazon you mentioned) and many of these make the type of latex mattress you are considering. I would call and talk with the ones that you are interested in in person. Your local testing and some research on their sites in combination with their help and guidance on the phone can help you decide which of the mattresses they offer would be the best choice for your body type and sleeping positions and well as your personal value equation.
Phoenix